diff --git a/tests/array.cc b/tests/array.cc
index 694850b..1e8ab57 100644
--- a/tests/array.cc
+++ b/tests/array.cc
@@ -1,5 +1,4 @@
 #include <assert.h>
-#include <string.h>
 #include "ostd/array.hh"
 #include "ostd/string.hh"
 
@@ -39,7 +38,7 @@ int main() {
 
     assert(z.size() == 5);
 
-    assert(!strcmp(to_string(z).data(), "{2, 4, 8, 16, 32}"));
+    assert(to_string(z) == "{2, 4, 8, 16, 32}");
 
     return 0;
 }
\ No newline at end of file
diff --git a/tests/utility.cc b/tests/utility.cc
index 35de0bd..a6d2b60 100644
--- a/tests/utility.cc
+++ b/tests/utility.cc
@@ -1,5 +1,4 @@
 #include <assert.h>
-#include <string.h>
 #include "ostd/utility.hh"
 #include "ostd/string.hh"
 
@@ -85,7 +84,7 @@ int main() {
     assert(x.second == 3.14f);
 
     auto st = make_pair(5, 10);
-    assert(!strcmp(to_string(st).data(), "{5, 10}"));
+    assert(to_string(st) == "{5, 10}");
 
     return 0;
 }
\ No newline at end of file
diff --git a/tests/vector.cc b/tests/vector.cc
index ee1765b..db094ef 100644
--- a/tests/vector.cc
+++ b/tests/vector.cc
@@ -1,5 +1,4 @@
 #include <assert.h>
-#include <string.h>
 #include "ostd/vector.hh"
 #include "ostd/string.hh"
 
@@ -85,7 +84,7 @@ int main() {
     assert(w.front() == 5);
     assert(w.back() == 5);
 
-    assert(!strcmp(to_string(w).data(), "{5, 5, 4, 5, 5, 5, 5, 5, 5, 5, 5}"));
+    assert(to_string(w) == "{5, 5, 4, 5, 5, 5, 5, 5, 5, 5, 5}");
 
     return 0;
 }
\ No newline at end of file